Folding automatic hydraulic jack



March 26, 1940. Q J. HALLEY 2,194,594

FOLDING AUTOMATIC HYDRAULIC JACK I Filed March 26, 1937 zsheetysheet 1//v l/E/V T0,? Joan /1 f/AL 4 EY 6 7 TOR/V5 Y March 26, 1940. J HALLEY2,194,594

FOLDING AUTOMATIC HYDRAULIC JACK Filed March 26, 1937 2 Sheets-Sheet 2//v VEN TO f? JOSEPH /7//7L 1. E)

y 7' roe/vie) Patented or. 26, 1940 FOLDWG AUTOTIG .11

' RAKILIC JACK Joseph Halley, Montreal, Quebec, Cda, as-

signor, by direct and mesne assignments, to Bailey's Automatic Hyc.llaclr Syndicate,

Montreal, Quebec,

Application March 26, 193?, aerial No. 133,223

3 ims.

This invention relates to hydraulic lifting jacks, particularly for useon vehicles, and of that kind which are operated by fluid underpressure, the fluid first causing the jack to be moved down from ahorizontal or out-of-use position into a position for use and thencausing the jack to be expanded in order to lift the vehicle. Inarrangements of this kind as applied to motor vehicles, a number ofjacks may be permanently attached to the chassis or other part of thevehicle so that they may be moved down into vertical positions, andexpanded, when desired, a common fluid storage tank being provided witha pump for supplying fluid to the jacks through suitably disposed pipesor conduits.

The object of the present invention is to provide a lifting jack of theabove kind of an improved and simple construction, which is emcient andreliable in action.

Accordingto the invention thehead of the jack is provided with a fluidadmission chamber adapted to turn, with the jack, relatively to a fixedvane or partition against which the fluid reacts.

to move the jack angularly into a. position for use. This fixed vane orpartition is preferably carried by a stationary shaft about which thejack is adapted to turn, the fluid being supplied through a passage inthe said shaft to the admission chamber. In order that the jack may beextended when it has been moved down into a position for use, the vaneor partition is provided with an aperture controlled by a valve which islifted from its seating at the required moment by a pin or projectionextending into the fluid admission chamber, so that the fluid thenpasses into the interior of the jack and expands the latter. The jackmay comprise two telescopic parts adapted to be extended by the fluid,the said parts being returned, when the fluid has been released, by aspring or springs. A spring or springs may also be used to return thejack into its horizontal out-of-use position.

In the accompanying drawings:

Figure 1 is a side elevational view of a hydraulic lifting jackconstructed in accordance with this invention, showing the same in itsOHt-Of-USG position, the dotted lines indicating the position of thejack when brought into aposition for use, but before being extended.

Figure 2 is a vertical section through the Jack upon a larger scale,when in its out-of-use position.

Figure 3 is atop planvlew of the jack partly in section when in itsout-of-use position.

Figure 4 is a side elevatlonal view of the jack (@IL car -es) in itsout-of-use position, showing the side opposite to that which isillustrated in Figure 1, and

Figure 5 shows a sectional view through the jacl: when partly extended.

Referring to the drawings, the improved jack it, as applied to a motorvehicle, isadapted to be fixed to the chassis of the vehicle, or to anyother suitable part, by means of a bracket I5, the latter being adaptedto be secured to the vehicle chassis, or other part, by means of anattachment member or plate I6. The bracket id is formed with 9.depending wall]? having an enlarged portion it at one end in which isprovided a bearing. Adjacent the said enlarged portion i8 is provided across-arm or supporting member 20 which extends horizontally at rightangles to the wall ii, the extremity of the said arm extending d0wn-Wards to provide a support M for a stationary :haft 22 about which thejack M is adapted to The jack I d is composed of two tubular telescopicsections 23 and 2d. The inner section M is screwed into a base member26, while the outer section 23, on the other hand, is screwed into ahead 25 fixed to a cylindrical casing 35 which is free to turn, with thejack about the fixed shaft 22. Anannular shoulder 21 isprovided at theone end of the inner section it of the jack, 9. similar shoulder 28being attached, such as by a screw, to the opposite end of the outersection 23. The two shoulders lessen friction between the parts andcooperate to prevent the jack sections from pulling too far apart. 'Apacking ring 29 may be provided adjacent the one end of the innersection, while housed within the latter, as shown in Figure 2, is a pairof coiled springs 33 and 3d disposed one within the other, with the endsof the spring 33 engaging stub-shafts 30 and 32, one fixed to the head25 of/the Jack and the other carried by a plate 3| fitting within thebase or foot portion.

The one-half of the cylindrical casing 35 to which the head 25 of thejack is attached, and which turns about the fixed shaft 22, is occupiedat the side nearest the head by a metal block 5! leaving a semi-circularchamber. The fluid for operating the jack is forced by a pump, notshown, through a conduit 56 (Figure 3) into a passage 52 extendingaxially through the shaft 22 and it enters the said semi-circularchamber in the casing 35 through a. radial passage 4| leading from thepassage 52; The said shaft 22 carlies a. fixed paddle, vane, orpartition 81 disposed horizontally and dividing the semi-circular fluidadmission chamber into two equal compartments ill 2d draw the part 26 ofthe jack inwards.

45 51) bears.

the jack is moved down into a vertical position,

36 and 35*, as clearly shown in Figure 2 of the drawings. An aperture 38is formed in said partition and is arranged to be closed by a ball 85,but adapted, when the ball is moved from its 5 seating, to provide acommunication between the two compartments 36 and 36", so that the fluidmay then pass from the compartment 36" into the compartment 36. Apassage 5G extends through the metal block 5| and leads from thecompart- 1o ment to to the inside of the inner telescopic part 28 of thejack, while a pin 89 carried by the said block Si is adapted whenthejack and the casing 35 turn through a suitable angle to engage theaperture 38 in the vane or partition and move 5 the ball 33 from itsseat.

When the jack is not required for use it is held in a substantiallyhorizontal position alongside the bracket i5 which is attached to thevehicle, in which position it is retained by a pin it,

carried by the base or foot oi the inner memat) pressure and the foot ofthe jack is clear of the ground, by means of the springs in and 5b whichare located within a tubular casing Q6 anchored at its one end to theouter part 23 of the jack. The spring it, which is a tension spring,passes through a central hole in the opposite end of the casing id, andis disposed within the spring which is of the compression type, the oneend of the latter spring bearing against a flange till surroundingthecentral hole through which the 40 spring it passes. The outer extremityof the tension spring at is anchored to a hook 35 attached to thecross-arm 2t and its inner ex= tremity is attached to a movable plate 69against which the inner end of the compression spring The arrangement issuch that when as illustrated in Figure I, the tension spring 418 iselongated, moving the plate is towards the upper part of the casingidand thereby compressing the spring $0. Both springs in this mannercombine to eiiect the raising of the jack, when the latter is notrequired for use.

When it is desired to bring the jack into use the fluid, which may beoil, is forced by the pump (not shown) through the conduit 56 (Figure 3)and enters the axial passage 52 in the fixed shaft 22, being forced intothe compartment 36 through the radial branch passage M. The fluid fillsthe said compartment and maintains the ball a0 38 against its seat.Since the fluid cannot escape it coacts with the fixed partition 3'!(which fits close up to the wall of the semi-circular chamber) andcauses the jack to move down angularly about the shaft 22 towards avertical position, the pressure of the ,fluid which effects this turningmovement first causing the pin 82 -to disengage from the notch 43, theinner part of the jack moving slightly outwards against the restrainingaction of the springs 33 and 34.

When the jack has nearly reached a vertical position the pin 39 entersthe aperture 88 and raises the ball 38 from its seat. The fluid nowpasses through the said aperture into the compartment areas and isforced through the passage 46 into the inside of the inner telescopicpart 26 of the jack. This part 24 is now forced downward by the fluid,against the action of the springs 38 and 86, until it reaches theground, when the outer part 33 of the jack rises (since the jaclccontinues to extend) and lifts the vehicle.

When the fluid is relieved of the pressure the weight of the vehicle,assisted by the springs 83 and it, cause the jack to collapse, the partto sliding partly within the outer part 23, the collapsing movementbeing continued after the foot or base 26 of the jack has left theground by the springs, until the two telescopic parts 23 and 243 he onewithin the other. Further, as soon as the base or foot it of the jackleaves the ground the jack is moved angularly bythe springs 38 and 5tback into its horiontal out-of-use position shown in Figure 1, the pin32 on the base or foot springing into the retaining recess 33.

A separate Jack of the above construction may be provided for liftingeach'wheel of the vehicle, the fluid beingsuppliecl by the pump from acommon reservoir, and any particular jack being brought into use asoccasion requires.

The springs 33 and 3d are arranged, in substantially the same manner asthe springs 68 and 5b, the inner spring 36, which is a tension springbeing attached atone end to the stubshait it and at its other end to thestub-shaft 32 which is carried by the plate Si, the latter being loosewithin the inner part 2d of the jack. The spring 86, on the other hand,is of the com-- pression type, its one end bearing against an internalflange 2d at the top of the inner part of the jack and at its other endbearing against the plate ill. Thus, when the jack is extended thesioned and the two springs cooperate to efiect the collapsing oi thejack when the fluid is relieved of the pressure.

What I claim as my invention is:

, spring 3% is compressed and the spring 33 ten- 1. A hydraulic Jackincluding an outer cylindrical jack section, an inner telescopicallyengaging Jack section, a. spring urging the sections into contractedpositions. hollow partially cylindrical head carried by theupper end ofthe outer jack section, and having a port leading into said section, atubular shaft upon which the head is mounted for rotative movement, apaddle mounthas rotated a predetermined distance to thereby abletherewith into engaging and disengaging ptnitions relative to said checkvalve.

3. A hydraulic jack as set forth in claim 1, characterized by springdevices for normally holding the jack in its inoperative elevatedposition and also acting to aid the aforesaid spring in urging thesecticns into contracted positions.

JOSEPH HALLEY.

